Field Service Procedure – Replacement Pol Pot Kit, USAT
Page
7
of
7
Document No
135929 Rev A
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Tel, Inc. This document may not be reproduced or distributed in any form without prior written
consent of Sea Tel, Inc.
10.
Verify
if
the
LNB
is
horizontal
in
the
center
of
the
pots
range
(120
counts),
if
the
LNB
is
not
horizontal
(as
per
Fig.
1.1)
repeat
steps
7
‐
9
until
correct,
otherwise
move
onto
step
11.
*Note:
The
tolerance
for
calibration
of
the
pol
pot
is
+/
‐
2
degrees,
meaning
the
LNB
can
be
aligned
+/
‐
2
degrees
from
horizontal
at
a
pol
count
of
120.
Any
error
will
be
electronically
trimmed
using
the
pol
offset
function.
11.
Now
the
pot
is
correctly
aligned
verify
feed
has
the
complete
180
degree
range
of
motion
by
driving
the
assembly
from
end
stop
to
end
stop:
Enter
the
command
“g0020”
into
the
remote
command
screen
of
the
DAC.
This
will
drive
the
feed
assembly
to
its
lower
electronic
end
stop
(set
by
the
potentiometer).
Once
the
pol
motor
has
finished
driving
the
LNB
should
be
vertical,
to
the
left
of
the
OMT
with
the
coax
cable
pointing
downwards
as
shown
below
in
Fig.
1.4.
Now
enter
the
command
“g0210”
into
the
remote
command
screen
of
the
DAC.
This
will
drive
the
feed
assembly
to
its
upper
electronic
end
stop
(set
by
the
potentiometer).
Once
the
pol
motor
has
finished
driving
the
LNB
should
be
vertical,
to
the
right
of
the
OMT
with
the
coax
cable
pointing
upwards
as
shown
below
in
Fig.
1.5.
(Fig.
1.4)
(Fig
1.5)
12.
Set
the
Pol
Type
to
automatic
(auto
pol):
Press
and
hold
the
arrow
keys
together
until
the
“EL
Trim”
or
“Auto
Trim”
window
is
displayed.
Push
the
arrow
key
to
scroll
through
the
settings
until
the
“Polang
Type”
window
is
displayed
and
press
the
arrow
key
to
activate
the
window.
Now
use
the
and
arrow
keys
to
scroll
the
cursor
along
and
use
the
and
arrow
keys
to
change
the
value
from
“0009”
to
“0072”
and
then
press
the
button
to
put
the
system
back
into
automatic
polang
(auto
pol)
mode.
Watch
the
LNB
and
verify
it
returns
to
the
correct
reception
position
(while
the
pol
motor
is
driving
the
target
light
will
be
illuminated
on
the
DAC).
*Note:
If
making
adjustments
to
the
polarization
alignment
of
a
VSAT
antenna
contacting
the
NOC
afterwards
to
run
through
a
cross
‐
pol
isolation
test
and
calibrating
the
antennas
pol
offset
setting
will
be
necessary.
13.
Save
the
settings
in
the
DAC
‐
2202:
Press
and
hold
the
arrow
keys
together
briefly,
“Save
New
Parameters”
will
be
displayed.
Press
the
arrow
key
to
activate
the
window
and
then
press
the
button,
“Parameters
Saved”
will
be
displayed
and
the
pol
type
and
pol
offset
will
be
stored
in
the
DAC.
Содержание USAT
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